#define lue 15
#define pinR 13
#define pinG 12
#define pinB 14
int val;

void setup() {
  Serial.begin(115200);
  pinMode(lue, INPUT);
  pinMode(pinR, OUTPUT);
  pinMode(pinG, OUTPUT);
  pinMode(pinB, OUTPUT);
}

void loop() {
  val = analogRead(lue);
  Serial.println(val);
  delay(100);

  if (val < 1000) {
    digitalWrite(pinR, LOW);
    digitalWrite(pinG, LOW);
    digitalWrite(pinB, LOW);
  }
  if (val >= 1000 && val < 2000) {
    digitalWrite(pinR, HIGH);
    digitalWrite(pinG, LOW);
    digitalWrite(pinB, LOW);
  }
  if (val >= 2000 && val < 3000) {
    digitalWrite(pinR, LOW);
    digitalWrite(pinG, HIGH);
    digitalWrite(pinB, LOW);
  }
  if (val >= 3000) {
    digitalWrite(pinR, LOW);
    digitalWrite(pinG, LOW);
    digitalWrite(pinB, HIGH);
  }
}